EP0156723B1 - Device for driving a magnetic tape by pinching, and its use - Google Patents

Device for driving a magnetic tape by pinching, and its use Download PDF

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Publication number
EP0156723B1
EP0156723B1 EP85400488A EP85400488A EP0156723B1 EP 0156723 B1 EP0156723 B1 EP 0156723B1 EP 85400488 A EP85400488 A EP 85400488A EP 85400488 A EP85400488 A EP 85400488A EP 0156723 B1 EP0156723 B1 EP 0156723B1
Authority
EP
European Patent Office
Prior art keywords
tape
axis
wheel
roller
cassette
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP85400488A
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German (de)
French (fr)
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EP0156723A1 (en
Inventor
Jean-Pierre Merle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schlumberger SA
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Schlumberger SA
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Filing date
Publication date
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Priority to AT85400488T priority Critical patent/ATE56836T1/en
Publication of EP0156723A1 publication Critical patent/EP0156723A1/en
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Publication of EP0156723B1 publication Critical patent/EP0156723B1/en
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
    • G11B23/04—Magazines; Cassettes for webs or filaments
    • G11B23/08—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends
    • G11B23/087—Magazines; Cassettes for webs or filaments for housing webs or filaments having two distinct ends using two different reels or cores
    • G11B23/08707—Details
    • G11B23/08778—Driving features, e.g. belt
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B15/00—Driving, starting or stopping record carriers of filamentary or web form; Driving both such record carriers and heads; Guiding such record carriers or containers therefor; Control thereof; Control of operating function
    • G11B15/18—Driving; Starting; Stopping; Arrangements for control or regulation thereof
    • G11B15/26—Driving record carriers by members acting directly or indirectly thereon
    • G11B15/28—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal
    • G11B15/29—Driving record carriers by members acting directly or indirectly thereon through rollers driving by frictional contact with the record carrier, e.g. capstan; Multiple arrangements of capstans or drums coupled to means for controlling the speed of the drive; Multiple capstan systems alternately engageable with record carrier to provide reversal through pinch-rollers or tape rolls

Definitions

  • the present invention relates to a device for driving a magnetic strip pinched between two rollers, the simultaneous rotation of which causes this strip to be driven, this device comprising a motor roller mounted to rotate around a first axis and supplying the energy. necessary for driving the strip, and a pressure roller, mounted for rotation about a second axis substantially parallel to the first and ensuring the pinching of the strip.
  • this height drift can be relatively small, for example of the order of a tenth of a millimeter.
  • the aim of the present invention is to propose a magnetic tape drive device introducing only a negligible drift of the tape, even when the latter is used back and forth and at temperatures. relatively low, around -40 ° C.
  • the device of the invention comprises the elements described in claim 1.
  • the fourth axis, around which the pressure roller is mounted to rotate is substantially perpendicular to the plane passing through the first and third axes.
  • this pressure roller preferably has a relatively large clearance possibility in a direction parallel to the plane joining the first and third axes.
  • the surface of the deflection roller advantageously has, for the strip, a high coefficient of friction, such as that which for example has a frosted metal surface.
  • the invention is particularly suitable for being used for driving magnetic tapes on which information is recorded and / or read back and forth or on-off.
  • the pressure roller can be carried by the cassette itself or integrated into the recording or reproducing apparatus with which the cassette is intended to be used.
  • the known belt drive device comprises a drive roller 1 mounted for rotation about a first axis A1 and a pressure roller 2 mounted for rotation about a second axis A2, substantially parallel to the first axis A1.
  • the magnetic strip 4 is pinched between the motor rollers 1 and the presser 2 without practically surrounding either of these two rollers.
  • the pressure roller 2 is for example made up of two discs 2a, 2b connected by a shaft 2c on which an elastic spring 5 carries elastically.
  • the pressure exerted by the spring 5 is transmitted via the pressure roller 2 to the strip 4 which is thus applied to the drive roller 1. Under these conditions, the rotation of the drive roller 1 ensures the simultaneous rotation of the pressure roller 2 and the longitudinal drive of the strip.
  • This known drive device has the drawback already mentioned that the strip 4 drifts in height on the roller 2 when it is operated back and forth, especially at low temperature.
  • FIG. 2 The device of the invention, which solves this problem, is represented in FIG. 2 in which the elements comparable to the elements illustrated in FIG. 1 are identified by the same references.
  • the device of the invention comprises a drive roller 1 mounted for rotation about an axis A1 and a pressure roller 2 mounted for rotation about an axis A2 substantially parallel to the axis A1.
  • the strip 4 is not pinched between the motor rollers 1 and the presser 2, but partially surrounds a return roller 3 mounted for rotation about an axis A3, substantially parallel to the other two axes A1 and A2.
  • the winding angle of the strip 4 around the return roller 3 is as large as possible and for example equal to or greater than 90 °.
  • the pressure roller 2 is resiliently biased both against the drive roller 1 and against the return roller 3, the drive and return rollers being in turn distant from each other.
  • the strip 4 is interposed and pinched between the pressure roller 2 and the return roller 3 and the energy of the movement, given by the drive roller 1, is transmitted by the pressure roller 2 to the return roller 3 and to band 4.
  • the pressure roller therefore becomes a motor, unlike the case of the prior device.
  • the pressure roller 2 is mounted for rotation not only around the axis A2, but also around an axis A4 substantially perpendicular to the axis A2 and to the plane passing through the axes A1 and A3 motor and idler rollers.
  • the axis A4 preferably represents the direction in which the pressure roller 2 is biased towards the rollers 1 and 3.
  • the pressure roller 2 must be biased in a direction which allows it to become tangent at the same time to the drive roller and to the return roller; however, this direction is approximately given by the perpendicular bisector of the segment delimited by the traces of the axes A1 and A2 in a plane perpendicular to the latter, when the drive rollers 1 and of the deflection 3 have substantially the same radius.
  • the pressure roller 2 is mounted for rotation in a stirrup 6 terminated by a perpendicular shaft 7 journalling in a support 8, and a coil spring 9 pushes the stirrup 6 from the support 8 in the direction of the rollers 1 and 3.
  • the apex angle A2 formed by the axes A1, A2 and A3 in a plane perpendicular to the latter is preferably at least equal to 60 ° and the shaft 7 slides in the support 8 with a certain play, so as to allow the axis A2, if necessary, to approach the axis A3 while moving away from the axis A1 or, conversely, to approach the axis A1 while moving away from the axis A3.
  • the pressure roller 2 has a possibility of movement in a direction parallel to the plane joining the axes A1 and A3.
  • the pressure roller 2 is formed from an entire cylinder rather than from two discs and consists of a metal roller covered with a layer of rubber 2 to 3 tenths of a millimeter thick.
  • the deflection roller 3 has a high coefficient of friction for the strip and is, for example, made up, at least on its external surface, of a frosted metal or metal alloy, for example of steel.
  • the drive roller 1 can itself be constituted by a metal roller covered with a thin layer of rubber, like the pressure roller.
  • FIG. 3 represents a cassette in which the device of the invention is integrated.
  • this cassette is already known to those skilled in the art, in particular by European patent EP 0 089 865 A1, so that a detailed description of this cassette is not necessary. .
  • the cassette comprises a plate 10 on which are mounted two coils 11, 12 which, respectively, unwind and wind the magnetic tape 4.
  • the magnetic strip passes over two idler rollers 16, 3 one of which, 3, is the idler roller which is part of the drive system of the invention.
  • the idler rollers 14a and 16 on the one hand and 14b and 3 on the other hand can be synchronized by means of O-belts 17a, 17b, in accordance with the teaching of the European patent mentioned above.
  • the pressure roller 2 is, with its caliper 6, the shaft 7 and the spring 9, mounted on a support 8 secured to the plate 10 while the drive roller 1, secured to a drive motor 18 is mounted on the turntable 19 of an apparatus for recording and / or reading information with which the cassette of the invention is intended to be used.
  • This device comprises at least one head 20 for recording and / or reading information. tions for example secured to the plate 19 as shown in FIG. 3.
  • FIG 4 shows exactly the same elements as Figure 3, identified by the same references.
  • the arrangement of the drive rollers 1 and of the return roller 3 is also modified in FIG. 4 so that the pressure roller 2 is resiliently urged against the drive rollers 1 and of the return roller 3 in a direction such that it exerts substantially the same pressure on each of these two rollers 1 and 3.
  • the vertical drift of the strip can be kept at a very low value, which can be evaluated at three or four hundredths of a millimeter at -40 ° C.
  • FIGS. 3 and 4 for a very specific type of cassette, it is understood that the invention can be used in particular in all cases where the drive system of FIG. 1 or similar systems were previously used.

Landscapes

  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Advancing Webs (AREA)
  • Toys (AREA)
  • Electrically Operated Instructional Devices (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Power Steering Mechanism (AREA)

Abstract

Tape drive apparatus having a drive roller 1 and pinch roller 2 including a idler roller 3 around which tape 4 passes. The pinch roller 2 which is rotatable about two normal axes (A2 and A4), is resiliently urged against the drive roller 1 and the idler roller 3, the two rollers being spaced apart from each other. This apparatus is particularly useful for magnetic tape cassettes, the pinch roller 2 being formed as either part of the cassette or as part of a tape recorder/player for using a cassette.

Description

La présente invention concerne un dispositif d'entraînement d'une bande magnétique pincée entre deux galets dont la rotation simultanée provoque l'entraînement de cette bande, ce dispositif comprenant un galet moteur monté à rotation autour d'un premier axe et fournissant l'énergie nécessaire à l'entraînement de la bande, et un galet presseur, monté à rotation autour d'un second axe sensiblement parallèle au premier et assurant le pincement de la bande.The present invention relates to a device for driving a magnetic strip pinched between two rollers, the simultaneous rotation of which causes this strip to be driven, this device comprising a motor roller mounted to rotate around a first axis and supplying the energy. necessary for driving the strip, and a pressure roller, mounted for rotation about a second axis substantially parallel to the first and ensuring the pinching of the strip.

Ces dispositifs d'entraînement de bande par pincement sont bien connus dans le domaine de l'enregistrement magnétique. Un exemple en est donné dans le brevet US 3.907.230 désignant le même inventeur.These pinch tape drives are well known in the field of magnetic recording. An example is given in US Patent 3,907,230 designating the same inventor.

En dehors de ce type d'entraînement par pincement, il existe également des systèmes d'entraînement à l'aide d'un axe d'enroulement, notamment celui décrit dans le brevet DE-C-723,995 qui fait appel à un ensemble de trois galets dont les axes respectifs de rotation sont parallèles. Selon ce système, un galet presseur est disposé entre un galet moteur et un galet de friction solidaire de l'axe d'enroulement. Le galet presseur est sollicité élastiquement contre les deux autres galets selon un axe perpendiculaire aux axes de rotation des galets, et il est monté à rotation autour de la direction suivant laquelle le galet est sollicité. Cependant, comme évoqué ci-dessus, un tel système ne concerne pas un entraînement par pincement de la bande.Apart from this type of pinch drive, there are also drive systems using a winding axis, in particular that described in patent DE-C-723,995 which uses a set of three rollers whose respective axes of rotation are parallel. According to this system, a pressure roller is disposed between a drive roller and a friction roller integral with the winding axis. The pressure roller is resiliently biased against the other two rollers along an axis perpendicular to the axes of rotation of the rollers, and it is rotatably mounted around the direction in which the roller is biased. However, as mentioned above, such a system does not relate to a pinch drive of the strip.

Les dispositifs connus, dans lesquels la bande est pincée directement entre le galet moteur et le galet presseur, présentent un défaut qui, bien que dépourvu de conséquences graves dans les cas courants, peut se révéler très gênant dans des applications spécifiques.Known devices, in which the strip is pinched directly between the drive roller and the pressure roller, have a defect which, although devoid of serious consequences in common cases, can be very troublesome in specific applications.

Plus précisément, lorsque le défilement de la bande implique de fréquents mouvements de va-et-vient ou de marche-arrêt, on constate que la bande dérive en hauteur sur le galet presseur, c'est-à-dire monte ou descend suivant la direction de l'axe de ce galet.More precisely, when the movement of the strip involves frequent back-and-forth or on-off movements, it is observed that the strip drifts in height on the pressure roller, that is to say goes up or down according to the direction of the axis of this roller.

A température ambiante, cette dérive en hauteur peut être relativement faible, par exemple de l'ordre du dizième de millimètre.At room temperature, this height drift can be relatively small, for example of the order of a tenth of a millimeter.

Néanmoins, cette dérive augmente lorsque la température diminue, au point d'atteindre typiquement six dizièmes de millimètre à -40°C.However, this drift increases when the temperature decreases, to the point of typically reaching six tenths of a millimeter at -40 ° C.

Lorsque les dérives atteignent ces valeurs, qui ne sont plus du tout négligeables par rapport à la largeur des pistes d'enregistrement correspondant aux informations enregistrées sur la bande, il en résulte, à la lecture de ces informations, un affaiblissement des signaux de lecture qui est au moins gênant, et parfois même inacceptable.When the drifts reach these values, which are no longer negligible at all compared to the width of the recording tracks corresponding to the information recorded on the tape, the result of this reading is a weakening of the read signals which is at least embarrassing, and sometimes even unacceptable.

Dans ce contexte, le but de la présente invention est de proposer un dispositif d'entraînement de bande magnétique n'introduisant qu-une dérive négligeable de la bande, même lorsque celle-ci est utilisée en va-et-vient et à des températures relativement basses, de l'ordre de -40°C.In this context, the aim of the present invention is to propose a magnetic tape drive device introducing only a negligible drift of the tape, even when the latter is used back and forth and at temperatures. relatively low, around -40 ° C.

A cet effet, le dispositif de l'invention comprend les éléments décrits dans la revendication 1.To this end, the device of the invention comprises the elements described in claim 1.

De préférence, le quatrième axe, autour duquel le galet presseur est monté à rotation, est sensiblement perpendiculaire au plan passant par les premier et troisième axes.Preferably, the fourth axis, around which the pressure roller is mounted to rotate, is substantially perpendicular to the plane passing through the first and third axes.

Pour obtenir un meilleur effet, on peut prévoir que la bande entoure le galet de renvoi sur un angle d'enroulement au moins égal à 90°.To obtain a better effect, provision may be made for the strip to surround the return roller over a winding angle at least equal to 90 °.

Afin que le galet presseur s'appuie correctement sur les galets moteur et de renvoi, ce galet presseur possède de préférence une possibilité de débattement relativement grande suivant une direction parallèle au plan joignant les premier et troisième axes.So that the pressure roller is properly supported on the drive and return rollers, this pressure roller preferably has a relatively large clearance possibility in a direction parallel to the plane joining the first and third axes.

En outre, ce résultat est d'autant plus facilement atteint si l'angle dont le sommet passe par le second axe et qui est formé par les premier, second et troisième axes dans un plan perpendiculaire à ces derniers est au moins égal à 60°.In addition, this result is all the more easily achieved if the angle whose apex passes through the second axis and which is formed by the first, second and third axes in a plane perpendicular to the latter is at least equal to 60 °. .

La surface du galet de renvoi présente avantageusement, pour la bande, un coefficient de frottement élevé, tel que celui que présente par exemple une surface métallique dépolie.The surface of the deflection roller advantageously has, for the strip, a high coefficient of friction, such as that which for example has a frosted metal surface.

L'invention est particulièrement adaptée à être utilisée pour l'entraînement de bandes magnétiques sur lesquelles des informations sont enregistrées et/ou lues en va-et-vient ou marche-arrêt.The invention is particularly suitable for being used for driving magnetic tapes on which information is recorded and / or read back and forth or on-off.

Le galet presseur peut être porté par la cassette elle-même ou intégré dans l'appareil d'enregistrement ou de reproduction avec lequel la cassette est destinée à être utilisée.The pressure roller can be carried by the cassette itself or integrated into the recording or reproducing apparatus with which the cassette is intended to be used.

D'autres caractéristiques et avantages de l'invention ressortiront de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence au dessin annexé, dans lequel:

  • - la figure 1 est un schéma en perspective d'un dispositif d'entraînement de bande connu à galet presseur et galet moteur.
  • - la figure 2 est un schéma en perspective du dispositif d'entraînement de bande conforme à l'invention;
  • - la figure 3 est un schéma du même dispositif appliqué à une cassette, le galet presseur étant intégré à la cassette;
  • - la figure 4 est un schéma du même dispositif appliqué à une cassette, le galet presseur étant intégré à l'appareil d'enregistrement et/ou de lecture d'informations avec lequel la cassette est destinée à être utilisée.
Other characteristics and advantages of the invention will emerge from the description which is given below, for information and in no way limitative, with reference to the appended drawing, in which:
  • - Figure 1 is a perspective diagram of a known tape drive device with pressure roller and drive roller.
  • - Figure 2 is a perspective diagram of the tape drive device according to the invention;
  • - Figure 3 is a diagram of the same device applied to a cassette, the pressure roller being integrated into the cassette;
  • - Figure 4 is a diagram of the same device applied to a cassette, the pressure roller being integrated in the recording and / or information reading apparatus with which the cassette is intended to be used.

Le principe utilisé dans l'art antérieur est représenté sur la figure 1.The principle used in the prior art is shown in Figure 1.

Le dispositif d'entraînement de bande connu comprend un galet moteur 1 monté à rotation autour d'un premier axe A1 et un galet presseur 2 monté à rotation autour d'un second axe A2, sensiblement parallèle au premier axe A1.The known belt drive device comprises a drive roller 1 mounted for rotation about a first axis A1 and a pressure roller 2 mounted for rotation about a second axis A2, substantially parallel to the first axis A1.

La bande magnétique 4 est pincée entre les galets moteur 1 et presseur 2 sans pratiquement entourer ni l'un ni l'autre de ces deux galets.The magnetic strip 4 is pinched between the motor rollers 1 and the presser 2 without practically surrounding either of these two rollers.

Le galet presseur 2 est par exemple constitué de deux disques 2a, 2b reliés par un arbre 2c sur lequel porte élastiquement un ressort en épingle 5.The pressure roller 2 is for example made up of two discs 2a, 2b connected by a shaft 2c on which an elastic spring 5 carries elastically.

La pression exercée par le ressort 5 est transmise par l'intermédiaire du galet presseur 2 à la bande 4 qui se trouve ainsi appliquée sur le galet moteur 1. Dans ces conditions, la rotation du galet moteur 1 assure la rotation simultanée du galet presseur 2 et l'entraînement longitudinal de la bande.The pressure exerted by the spring 5 is transmitted via the pressure roller 2 to the strip 4 which is thus applied to the drive roller 1. Under these conditions, the rotation of the drive roller 1 ensures the simultaneous rotation of the pressure roller 2 and the longitudinal drive of the strip.

Ce dispositif d'entraînement connu présente l'inconvénient déjà évoqué que la bande 4 dérive en hauteur sur le galet 2 lorsqu'elle est exploitée en va-et-vient, surtout à basse température.This known drive device has the drawback already mentioned that the strip 4 drifts in height on the roller 2 when it is operated back and forth, especially at low temperature.

Le dispositif de l'invention, qui résoud ce problème, est représenté sur la figure 2 sur laquelle les éléments comparables aux éléments illustrés sur la figure 1 sont repérés par les mêmes références.The device of the invention, which solves this problem, is represented in FIG. 2 in which the elements comparable to the elements illustrated in FIG. 1 are identified by the same references.

Comme le dispositif connu, le dispositif de l'invention comprend un galet moteur 1 monté à rotation autour d'un axes A1 et un galet presseur 2 monté à rotation autour d'un axe A2 sensiblement parallèle à l'axe A1.Like the known device, the device of the invention comprises a drive roller 1 mounted for rotation about an axis A1 and a pressure roller 2 mounted for rotation about an axis A2 substantially parallel to the axis A1.

Cependant, à la différence de la disposition connue, la bande 4 n'est pas pincée entre les galets moteur 1 et presseur 2, mais entoure partiellement un galet de renvoi 3 monté à rotation autour d'un axe A3, sensiblement parallèle aux deux autres axes A1 et A2. L'angle d'enroulement de la bande 4 autour du galet de renvoi 3 est aussi grand que possible et par exemple égal ou supérieur à 90°.However, unlike the known arrangement, the strip 4 is not pinched between the motor rollers 1 and the presser 2, but partially surrounds a return roller 3 mounted for rotation about an axis A3, substantially parallel to the other two axes A1 and A2. The winding angle of the strip 4 around the return roller 3 is as large as possible and for example equal to or greater than 90 °.

Le galet presseur 2 est élastiquement sollicité à la fois contre le galet moteur 1 et contre le galet de renvoi 3, les galets moteur et de renvoi étant quant à eux distants l'un de l'autre.The pressure roller 2 is resiliently biased both against the drive roller 1 and against the return roller 3, the drive and return rollers being in turn distant from each other.

De cette façon, la bande 4 se trouve interposée et pincée entre le galet presseur 2 et le galet de renvoi 3 et l'énergie du mouvement, donnée par le galet moteur 1, est transmise par le galet presseur 2 au galet de renvoi 3 et à la bande 4. Pour la bande 4, le galet presseur devient donc moteur, contrairement au cas du dispositif antérieur.In this way, the strip 4 is interposed and pinched between the pressure roller 2 and the return roller 3 and the energy of the movement, given by the drive roller 1, is transmitted by the pressure roller 2 to the return roller 3 and to band 4. For band 4, the pressure roller therefore becomes a motor, unlike the case of the prior device.

Selon une caractéristique de l'invention, le galet presseur 2 est monté à rotation non seulement autour de l'axe A2, mais aussi autour d'un axe A4 sensiblement perpendiculaire à l'axe A2 et au plan passant par les axes A1 et A3 des galets moteur et de renvoi.According to a characteristic of the invention, the pressure roller 2 is mounted for rotation not only around the axis A2, but also around an axis A4 substantially perpendicular to the axis A2 and to the plane passing through the axes A1 and A3 motor and idler rollers.

En outre, l'axe A4 représente de préférence la direction suivant laquelle le galet presseur 2 est sollicité vers les galets 1 et 3.In addition, the axis A4 preferably represents the direction in which the pressure roller 2 is biased towards the rollers 1 and 3.

En toute rigueur, le galet presseur 2 doit être sollicité suivant une direction qui lui permette de devenir tangent en même temps au galet moteur et au galet de renvoi; néanmoins cette direction est approximativement donnée par la médiatrice du segment délimité par les traces des axes A1 et A2 dans un plan perpendiculaire à ces derniers, lorsque les galets moteur 1 et de renvoi 3 ont sensiblement le même rayon.Strictly speaking, the pressure roller 2 must be biased in a direction which allows it to become tangent at the same time to the drive roller and to the return roller; however, this direction is approximately given by the perpendicular bisector of the segment delimited by the traces of the axes A1 and A2 in a plane perpendicular to the latter, when the drive rollers 1 and of the deflection 3 have substantially the same radius.

Par exemple, le galet presseur 2 est monté à rotation dans un étrier 6 terminé par un arbre perpendiculaire 7 tourillonnant dans un support 8, et un ressort à boudin 9 repousse l'étrier 6 du support 8 en direction des galets 1 et 3.For example, the pressure roller 2 is mounted for rotation in a stirrup 6 terminated by a perpendicular shaft 7 journalling in a support 8, and a coil spring 9 pushes the stirrup 6 from the support 8 in the direction of the rollers 1 and 3.

Pour que le galet presseur puisse s'appuyer correctement sur les galets moteur 1 et de renvoi 3, l'angle de sommet A2 formé par les axes A1, A2 et A3 dans un plan perpendiculaire à ces derniers est de préférence au moins égal à 60° et l'arbre 7 coulisse dans le support 8 avec un certain jeu, de manière à autoriser l'axe A2, si besoin en est, à se rapprocher de l'axe A3 tout en s'éloignant de l'axe A1 ou, inversement, à se rapprocher de l'axe A1 tout en s'éloignant de l'axe A3.So that the pressure roller can properly rest on the drive rollers 1 and return 3, the apex angle A2 formed by the axes A1, A2 and A3 in a plane perpendicular to the latter is preferably at least equal to 60 ° and the shaft 7 slides in the support 8 with a certain play, so as to allow the axis A2, if necessary, to approach the axis A3 while moving away from the axis A1 or, conversely, to approach the axis A1 while moving away from the axis A3.

En d'autres termes, le galet presseur 2 possède une possibilité de débattement dans une direction parallèle au plan joignant les axes A1 et A3.In other words, the pressure roller 2 has a possibility of movement in a direction parallel to the plane joining the axes A1 and A3.

Bien qu'il soit difficile de donner ta valeur minimale de ce débattement, on peut dire qu'il doit être au moins égal au jeu qu'il est nécessaire de rattraper du fait des imperfections des galets et de leur dilatations ou contractions en fonction de la température.Although it is difficult to give your minimum value of this clearance, we can say that it must be at least equal to the play that it is necessary to make up for due to the imperfections of the rollers and their dilations or contractions depending on temperature.

De préférence, le galet presseur 2 est formé d'un cylindre entier plutôt que de deux disques et est constitué par un galet métallique recouvert d'une couche de caoutchouc de 2 à 3 dizièmes de millimètre d'épaisseur.Preferably, the pressure roller 2 is formed from an entire cylinder rather than from two discs and consists of a metal roller covered with a layer of rubber 2 to 3 tenths of a millimeter thick.

Le galet de renvoi 3 présente pour la bande un coefficient de frottement élevé et est par exemple constitué, au moins sur sa surface externe, d'un métal ou alliage métallique dépoli, d'acier-par exemple.The deflection roller 3 has a high coefficient of friction for the strip and is, for example, made up, at least on its external surface, of a frosted metal or metal alloy, for example of steel.

Le galet moteur 1 peut lui-même être constitué par un galet métallique recouvert d'une fine couche de caoutchouc, comme le galet presseur.The drive roller 1 can itself be constituted by a metal roller covered with a thin layer of rubber, like the pressure roller.

La figure 3 représente une cassette dans laquelle est intégré le dispositif de l'invention.FIG. 3 represents a cassette in which the device of the invention is integrated.

Mis à part le dispositif de l'invention, cette cassette est déjà connue de l'homme de l'art, notamment par le brevet européen EP 0 089 865 A1, de sorte qu'une description détaillée de cette cassette n'est pas nécessaire.Apart from the device of the invention, this cassette is already known to those skilled in the art, in particular by European patent EP 0 089 865 A1, so that a detailed description of this cassette is not necessary. .

La cassette comprend une platine 10 sur laquelle sont montées deux bobines 11, 12 qui, respectivement, dévident et enroulent la bande magnétique 4.The cassette comprises a plate 10 on which are mounted two coils 11, 12 which, respectively, unwind and wind the magnetic tape 4.

Ces bobines sont synchronisées au moyen d'une courroie élastique 13 passant sur des galets de renvoi 14a, 14b et sur un galet flottant 15 qui applique cette courroie contre les bobines.These coils are synchronized by means of an elastic belt 13 passing over idler rollers 14a, 14b and over a floating roller 15 which applies this belt against the coils.

La bande magnétique passe sur deux galets de renvoi 16, 3 dont l'un, 3, est le galet de renvoi qui fait partie du système d'entraînement de l'invention.The magnetic strip passes over two idler rollers 16, 3 one of which, 3, is the idler roller which is part of the drive system of the invention.

Les galets de renvoi 14a et 16 d'une part et 14b et 3 d'autre part peuvent être synchronisés au moyen de courroies toriques 17a, 17b, conformément à l'enseignement du brevet européen mentionné ci-dessus.The idler rollers 14a and 16 on the one hand and 14b and 3 on the other hand can be synchronized by means of O-belts 17a, 17b, in accordance with the teaching of the European patent mentioned above.

Le galet presseur 2 est, avec son étrier 6, l'arbre 7 et le ressort 9, monté sur un support 8 solidaire de la platine 10 tandis que le galet moteur 1, solidaire d'un moteur d'entraînement 18 est monté sur la platine 19 d'un appareil d'enregistrement et/ou de lecture d'informations avec lequel la cassette de l'invention est destinée à être utilisée. Cet appareil comporte au moins une tête 20 d'enregistrement et/ou de lecture d'informations par exemple solidaire de la platine 19 comme le montre la figure 3.The pressure roller 2 is, with its caliper 6, the shaft 7 and the spring 9, mounted on a support 8 secured to the plate 10 while the drive roller 1, secured to a drive motor 18 is mounted on the turntable 19 of an apparatus for recording and / or reading information with which the cassette of the invention is intended to be used. This device comprises at least one head 20 for recording and / or reading information. tions for example secured to the plate 19 as shown in FIG. 3.

La figure 4 représente exactement les mêmes éléments que la figure 3, repérés par les mêmes références.Figure 4 shows exactly the same elements as Figure 3, identified by the same references.

La seule différence entre les figures 3 et 4 est que cette dernière correspond au cas où le galet presseur 2 n'est pas intégré à la cassette, mais à l'appareil utilisant celle-ci.The only difference between Figures 3 and 4 is that the latter corresponds to the case where the pressure roller 2 is not integrated with the cassette, but with the device using the latter.

C'est ainsi qu'on peut voir, sur la figure 4, que le support 8 n'est plus solidaire de la platine 10 de la cassette, mais de la platine 19 de l'appareil, qui supporte également le moteur 18, le galet moteur 1 et la tête 20.This is how we can see, in FIG. 4, that the support 8 is no longer integral with the plate 10 of the cassette, but with the plate 19 of the device, which also supports the motor 18, the drive roller 1 and head 20.

Par rapport à la figure 3, la disposition des galets moteur 1 et de renvoi 3 est également modifiée sur la figure 4 de façon que le galet presseur 2 soit élastiquement sollicité contre les galets moteur 1 et de renvoi 3 suivant une direction telle qu'il exerce sensiblement la même pression sur chacun de ces deux galets 1 et 3.Compared to FIG. 3, the arrangement of the drive rollers 1 and of the return roller 3 is also modified in FIG. 4 so that the pressure roller 2 is resiliently urged against the drive rollers 1 and of the return roller 3 in a direction such that it exerts substantially the same pressure on each of these two rollers 1 and 3.

Grâce à la disposition décrite, la dérive en hauteur de la bande peut être maintenue à une valeur très faible, qui peut être évaluée à trois ou quatre centièmes de millimètre à - 40°C.Thanks to the arrangement described, the vertical drift of the strip can be kept at a very low value, which can be evaluated at three or four hundredths of a millimeter at -40 ° C.

Bien que l'invention ait été décrite en référence aux, figures 3 et 4, pour un type de cassette très particulier, il est bien entendu que l'invention est notamment utilisable dans tous les cas où le système d'entraînement de la figure 1 ou des systèmes analogues étaient antérieurement utilisés.Although the invention has been described with reference to, FIGS. 3 and 4, for a very specific type of cassette, it is understood that the invention can be used in particular in all cases where the drive system of FIG. 1 or similar systems were previously used.

Claims (10)

1. A device for driving a magnetic tape (4) pinched between two wheels, such that simultaneous rotation of the wheels causes the tape to be driven, the device comprising a drive wheel (1) mounted to rotate about a first axis and providing the energy required for driving the tape, and a presser wheel (2) mounted to rotate about a second axis substantially parallel to the first and serving to pinch the tape, the device being characterized in that it further includes a return wheel (3) over which the tape passes, the return wheel being distant from the drive wheel and being mounted to rotate about a third axis (A3) substantially parallel to the first two axes, and in that the presser wheel (2) is resiliently urged both against the tape (4) passing over the return wheel (3) and against the drive wheel (1), and is mounted to swivel about a fourth axis (A4) substantially perpendicular to the second axis (A2) and substantially parallel to the direction along which the presser wheel (2) is urged.
2. A device according to claim 1, characterized in that the fourth axis (A4) is substantially perpendicular to the plane including the first and third axes (A1, A3).
3. A device according to claim 1 or 2, characterized in that the tape (4) winds round the return wheel (3) through a winding angle of not less than 90°.
4. A device according to any preceding claim, characterized in that the presser wheel (2) is provided with freedom to move in a direction parallel to the plane (8) including the first and third axes (A1, A3).
5. A device according to any preceding claim, characterized in that the angle formed between the first, second, and third axes (A1, A2, A3) in a plane perpendicular thereto and having its vertex at the second axis (A2) is not less than 60°.
6. A device according to any preceding claim, characterized in that the surface of the return wheel (3) has a high coefficient of friction with the tape (4).
7. A device according to claim 6, characterized in that the surface of the return wheel (3) is metal and dull.
8. An application of the device according to any preceding claim to driving a tape in a cassette (10) wherein the presser wheel (2) is carried by the cassette.
9. An application of the device according to any one of claims 1 to 7 to driving a tape (4) of a cassette (10) intended to be used with a recording and/or playback apparatus, wherein the presser wheel (2) is carried by the apparatus.
10. An application of the device according to any one of claims 1 to 7, to driving a tape (4) of a cassette (10) on which information is recorded or read with back-and-forth motion.
EP85400488A 1984-03-19 1985-03-14 Device for driving a magnetic tape by pinching, and its use Expired - Lifetime EP0156723B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85400488T ATE56836T1 (en) 1984-03-19 1985-03-14 MAGNETIC BELT DRIVE DEVICE BY PRESSING AND ITS APPLICATION.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8404197 1984-03-19
FR8404197A FR2561426B1 (en) 1984-03-19 1984-03-19 MAGNETIC TAPE DRIVE DEVICE AND APPLICATION

Publications (2)

Publication Number Publication Date
EP0156723A1 EP0156723A1 (en) 1985-10-02
EP0156723B1 true EP0156723B1 (en) 1990-09-19

Family

ID=9302165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85400488A Expired - Lifetime EP0156723B1 (en) 1984-03-19 1985-03-14 Device for driving a magnetic tape by pinching, and its use

Country Status (7)

Country Link
US (1) US4624399A (en)
EP (1) EP0156723B1 (en)
JP (1) JPS61953A (en)
AT (1) ATE56836T1 (en)
CA (1) CA1250663A (en)
DE (1) DE3579721D1 (en)
FR (1) FR2561426B1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0741672B2 (en) * 1988-05-07 1995-05-10 新日本工機株式会社 Automatic tape sticking device
EP0565736B1 (en) * 1991-10-31 1998-06-17 Sony Corporation Tape cassette
NL9500244A (en) * 1994-02-17 1995-10-02 Matsushita Electric Ind Co Ltd Tape cassette
JP4770313B2 (en) 2005-07-27 2011-09-14 ソニー株式会社 Audio signal generator

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DE723995C (en) * 1938-11-27 1942-08-15 Aeg Drive device for sound carrier
US2373107A (en) * 1943-07-15 1945-04-10 Duffy Charles Hugh Mechanical movement
US2499699A (en) * 1947-06-06 1950-03-07 Magnecord Inc Wire and tape driving means
DE872660C (en) * 1949-01-01 1953-04-02 Licentia Gmbh Drive device for tape
FR1067319A (en) * 1952-12-01 1954-06-15 Scintilla Ag Friction wheel drive mechanism without flywheel, for tape recorders
US2990092A (en) * 1954-10-08 1961-06-27 Clevite Corp Tape drive mechanism
DE1128676B (en) * 1957-08-03 1962-04-26 Loewe Opta Ag Drive device for magnetic tapes that can be played in two different directions
US2858130A (en) * 1957-08-28 1958-10-28 Kenneth R Baur Dual pinch roll assembly
CH352505A (en) * 1958-02-22 1961-02-28 H & J J Bessire S A Device for driving an unperforated magnetic tape
US2998906A (en) * 1958-11-24 1961-09-05 Minnesota Mining & Mfg Capstan idler assembly
US3402868A (en) * 1966-12-16 1968-09-24 Vm Corp Tape drive arrangement
DE1812226B1 (en) * 1968-12-02 1970-08-20 Windmoeller & Hoelscher Preference device for material webs in web processing machines, especially printing machines
US3604606A (en) * 1969-07-09 1971-09-14 Digitronics Corp Drive mechanism employing reaction forces
US3938752A (en) * 1969-11-26 1976-02-17 Mann Donald V Auxiliary drive endless loop tape cartridge
US3692255A (en) * 1971-06-17 1972-09-19 Minnesota Mining & Mfg Belt driven tape cartridge
CH575636A5 (en) * 1972-08-21 1976-05-14 Schlumberger Inst System
US3877627A (en) * 1973-10-26 1975-04-15 Eastman Kodak Co Pinch roller/capstan web drive
DE2744782A1 (en) * 1977-10-05 1979-04-12 Veba Chemie Ag STORAGE-STABLE STOVE ENAMELS
EP0011467A1 (en) * 1978-11-16 1980-05-28 Anthony Brendon Waddington Tape cassette
FR2523754A1 (en) * 1982-03-17 1983-09-23 Enertec ELASTIC BELT CASSETTE WITH CONTROLLED SPEED

Also Published As

Publication number Publication date
EP0156723A1 (en) 1985-10-02
JPS61953A (en) 1986-01-06
FR2561426A1 (en) 1985-09-20
CA1250663A (en) 1989-02-28
ATE56836T1 (en) 1990-10-15
US4624399A (en) 1986-11-25
FR2561426B1 (en) 1990-03-30
DE3579721D1 (en) 1990-10-25

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